Method of selecting electrical impulses.



D. W. TROY.Y METHOD 0E SELEGTING ELECTRICAL IMEULSES. APPLICATION FLLED APR. 8, '1904. .N0 MODEL.

. TH: Namzls PETERS co., w/nsumaraw, o. c.

PATENTEE Nov. 15,1904.

Patented Noveriibwic, 1904.

PATENT OFFICE..

DANIEL WATTS TROY, OF NEW YORK, N. Y.

i METHOD OF SELECTING ELECTRICAL IMPuLsEs.

- SPECIFICATION forming part 'of Letters Patent No. 775,050, dated Nppember I5, 1904. Application filed Aprn s, 1904. serai No. 202.269 (No man.)

To @all whom it may concer/t:

Be it known-abat I, DANIEL WAT'rs TROY, a citizen of the United States of A Y ca, residingin the city, county, and State of New York,

. (with a post-oce address at No. 32 Broadway,

in said city,) have invented certain new-and useful Improvements in Methods of Selecting i Electrical impulses, o' which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

` This invention relates to the selective reception of electrical impulses, such'as those used in wireless or space telegraphy, wireless control of apparatus at a distance and otherwise, and to the selective reception of electrical cur- .rents of alternating, pulsatory,pr oscillatory character. The method herein 'set forth and claimed is shown to some extent in my prior application, Serial No. 165,152, filed July 11,

1903, and is subordinate to the general method therein claimed.

The object ofthe present invention is to provide a simple and efficient method of. selectively receiving electrical impulses of one or approximate frequency to the exclusion of such impulses of other frequencies. This method does not involve necessarily the use of syntonic receiving-conductors',though it may be used to advantage in connection therewith, if desired.

. 1n the present invention the method of phase-splitting described in my said prior application is utilized in a somewhat different manner fromthat claimed in said application. This method is intended to have the scope of my general method in so far as possible in application to practice as set forth in said prio application. 4

'ln the drawings, Figure lis one type of apparatus illustrating the method. l2igs. 2 and 3 are a modified type; Fig. 4, a type of apparatus utilizing` the electromagnetic effect, While Fig. 5 is a diagram illustrative of the descriptionof the effect of the ninety-degree phasefsplitting. l

Broadly, the method herein claimed con? sists in splitting the phaseof the received impulses'and then energizing by the respective.-

components, whichk are ninety degrees apart in phase at the Aproper frequency, apparatus of a vibratory character having a frequency of twice thatof the received impulses. For example, if there be a split of phase of such degree the current direction in the l:franches of the split will be fr each quarter-eycleas indicated in Fig. 5,'where it willV be seen that for the first quarter-cycle the currents will be opposite in direction', for the, next quarter in the same direction, and so on, alternating every quarter-cycle, 1, 2, 3, and e, ,a and a' representing the curves of the components of the Isplit upon a line of zero values in Fig. 7' is a reed of normal frequency or rate N and having at its free end a disk of metal y. Approximated to y is similar disk y'. w is a receiving-conductor, as a vertical in wireless telegraphy, ora conductor energized through such vertical by induction, as may be desired. ya i s,a condenser connected betweenw and y at w', and a coil having self-induction connected similarly toy by 4w". a and Z) are so prpportioned to the im-v pulses desired rto be sefected as to produce a phase difference of ninety degrees in the two branches of the split, and hence between the disks Lfand y', at thefrequency of the said impulses in the ligure, wg and wg' are grounds, in this case the direct impulses received by the vertical being used. The construction in the case of selectively receiving an alternating current is obvious. From the fact that the disks y and y' will mutually attract and4 repel twice every half-cyle if energized 'as described it is obvious that with such an apparatus only approximately the related frequency will be able to operate the device. Aside from the novel utilization of the phase split in energizing the device the operation is analogous to the devices hereto well known in harmonic telegraphy.

It is to be understood that .the connections to earth wg wp' are made through resistances R and R of sufficient value to prevent instantaneous reduction of the potential of the opposing plates to that of earth, and in cases where the out-of-phase plates are embraced in a circuit suitable resistance is obviously in- .tended to be' interpolated in the conductors, as vin wg and wg in Fig. l, for the same purpose.

In Fig.' 2 and Fig. 8 a somewhat different IOO I Wapen; I

type of vibrating member is shown, though energized in the same manner as the apparatus shown in Fig. 1. A double-bladed vibrating member f1/fr yu is suspended by a biiilar suspension (shown at wr wir, Fig. 3) over insulated plates /m and m, which are supported by insulating' supports c and 'c'. The op eration is the same as in Fig. 1. The connections of the plates in Figs. 2-and 3 are not shown in the figures. The upper doublebladed vibratory member wouldy be energized by, say, the lagging branch of the split, while the two lower and fixed plates would be energized by the leading branch, or vice versa. rIhe lower fixed plates correspond to the fixed plate i/ of Fig. 1. A mirror m, carried on -the vibrating member, serves to indicate the movement of the device by the displacement ofa spot of light in a manner well known in electrical art. 1t is'obvious that any desired means may be used toindicate the' movement of theivibrating members under this method. The rate of the vibrating' member in Figs. '2 and 3 is cont-rolled, of course, by the tension and distance apart of -the suspension-wires fwr wr.

In Fig. 4 the vibrating reed 1 has at its free end a coil co, opposite to which is a fixed coil co. The coils. obviously have for each quarter-cycle the frequency presumed to be N/2, or half that of the reed itself, oppositely- Y directional currents, and hence mutually atrate.

tract twice and muitually repel twice in each cycle.

Owing to the extremely-high frequencies used. in wireless or space telegraphy and in the wireless control of apparatus it is obvi- .ous that the electrostatic types of instrument and modifications thereofl would be preferable as entalling no great loss due to magnetic reactance. However, Where the frequency is low the coils offer certain advan me March 19, 1903, Serial No. 148,529, the

reed could be easily made with the requisite l It is not of course intended that a mere mechanical reed could be made to vibrate nor mally at a rate twice that of the waves used in Hertzian telegraphy, where the frequencies are enormous. Where used in connection with waves of such high frequency, .the

mechanical difficulty of course would limit the4 use of this method as described herein.

.Having describedJ my invention, what I claim isi 1. The method herein set forth consisting in operating vibratory reeeivingapparatus by the mutual action of components of received impulses at approximately ninety degreels difference of phase, substantially as set fort i.

' 2. The method hereinv set forth, consisting in splitting the phase of received impulses by means related to the frequency of the imv .pulses desired to be selected, and operating vibratory receiving apparatus by the mutual action of the phase-differing components of -the split at a. difference 'in phase of such components of approximately ninety degrees, substantially as set forth.

3. The method hereiuset forth, consisting :in splitting the phase. of received impulses by means related tothe frequency of the impulses desired .to be selected, and operating vibratory receiving apparatus by the mutual action of the phase-differing components of such split, substantially as set forth..

4. The method herein set forth, consisting in producing aphase splitof approximately ninety degrees in the'received impulses and energizing by the mutual action of the components so produced vibratory apparatus of a rate related to the frequency of the impulses to be selected, substantially as set forth.

5. rihe method herein set forth, consisting inutilizing the alternate mutual attraction and repulsion of components of received impulses at a phase differenceof approximately ninety degrees to operate vibratory receiving` apparatus of a rate related .to the frequency of the impulses to be selected, substantially as set forth.

6. The'method herein set forth, consisting in utilizing the alternate mutual attraction and repulsion of split-phase components of received impulses at approximately ninety degrees phase dierence to produce vibratory motion in a receiving apparatus, substantially as set forth. Y

7. The method herein set forth, consisting in producing'vibratory motion in receiving apparatus by the mutual alternate attraction and repulsion of components of received impulsesat approximately ninety degrees phase difference, substantially as set forth.

8. The method herein set forth, consisting in producing vibratory motion related to the frequency of the impulses to be selected .by the mutual alternate attraction and repulsionv of components of received impulses at approximately ninety degrees phase difference,

substantially as set forth.

ln witness `whereof I have hereunto set my hand, atv New York, NY., this 12th day of March, 1904.

' W. T. PAT'rnnsoN,

WILLIAM L. PATTERSON.

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